unicorn/prefer-set-size Correctness

✅ This rule is turned on by default.

🛠️ An auto-fix is available for this rule.

What it does

Prefer Set#size over Set#length when the Set is converted to an array.

Why is this bad?

Using Set#size is more readable and performant.

Examples

Examples of incorrect code for this rule:

const length = [...new Set([1, 2, 3])].length;

Examples of correct code for this rule:

const size = new Set([1, 2, 3]).size;

How to use

To enable this rule in the CLI or using the config file, you can use:

CLI

oxlint --deny unicorn/prefer-set-size

Config (.oxlintrc.json)

{
  "rules": {
    "unicorn/prefer-set-size": "error"
  }
}

References

• Rule Source